AZ Nomad wrote:

Before starting a wash, do you make sure that no dishes are
blocking the rotating sprayer arm?

Thanks. We do try to check for that but sometimes could do better
about not cramming stuff in.

The thing is that sometimes the water doesn't circulate at all during
at least the first rinse cycle (just that humming noise I mentioned,)
so I don't think blocking the rotating sprayer is the main problem.

Paul